Sound absorption device

An assembly comprising:

• a duct configured to guide an air flow;
• a beam configured to support a movable element of a thrust reverser of an aircraft engine, the beam comprising a wall delimiting a plurality of cavities opened to the air flow;
• and
• an acoustic fairing comprising:
• a cover comprising a first layer and a second layer, the second layer being superimposed onto the first layer, the first layer having a first stiffness and the second layer having a second stiffness lower than the first stiffness, a plurality of orifices being provided through the first layer, the second layer being acoustically porous;
• and
• a plurality of partitions secured to the cover;
• wherein the acoustic fairing is configured to be added and fixed onto the beam so that the cover delimits a portion of the duct by obturating the plurality of cavities, and so that each of the plurality of partitions extends within one of the plurality of cavities so that the acoustic fairing and the beam delimit a plurality of acoustic cells configured to absorb an acoustic wave propagating from the air flow;
• and
• wherein, once the acoustic fairing is added and fixed onto the beam, the first layer obturates the plurality of cavities and the second layer delimits the portion of the duct.